Definition df-i1p 7408

Description: Define the positive real constant 1. This is a "temporary" set used in the construction of complex numbers and is intended to be used only by the construction. (Contributed by Jim Kingdon, 25-Sep-2019.)

Assertion

Ref	Expression
df-i1p	⊢ 1P = ⟨{𝑙 ∣ 𝑙 <Q 1Q}, {𝑢 ∣ 1Q <Q 𝑢}⟩

Distinct variable group:   𝑢,𝑙

Detailed syntax breakdown of Definition df-i1p

Step	Hyp	Ref	Expression
1		c1p 7233	. 2 class 1P
2		vl	. . . . . 6 setvar 𝑙
3	2	cv 1342	. . . . 5 class 𝑙
4		c1q 7222	. . . . 5 class 1Q
5		cltq 7226	. . . . 5 class <Q
6	3, 4, 5	wbr 3982	. . . 4 wff 𝑙 <Q 1Q
7	6, 2	cab 2151	. . 3 class {𝑙 ∣ 𝑙 <Q 1Q}
8		vu	. . . . . 6 setvar 𝑢
9	8	cv 1342	. . . . 5 class 𝑢
10	4, 9, 5	wbr 3982	. . . 4 wff 1Q <Q 𝑢
11	10, 8	cab 2151	. . 3 class {𝑢 ∣ 1Q <Q 𝑢}
12	7, 11	cop 3579	. 2 class ⟨{𝑙 ∣ 𝑙 <Q 1Q}, {𝑢 ∣ 1Q <Q 𝑢}⟩
13	1, 12	wceq 1343	1 wff 1P = ⟨{𝑙 ∣ 𝑙 <Q 1Q}, {𝑢 ∣ 1Q <Q 𝑢}⟩

This definition is referenced by:  1pr  7495  1prl  7496  1pru  7497  addnqpr1  7503  caucvgsr  7743  pitonnlem1  7786  recidpipr  7797  nntopi  7835